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4/7(x+21)=-4
We move all terms to the left:
4/7(x+21)-(-4)=0
Domain of the equation: 7(x+21)!=0We add all the numbers together, and all the variables
x∈R
4/7(x+21)+4=0
We multiply all the terms by the denominator
4*7(x+21)+4=0
Wy multiply elements
28x(x+4=0
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